<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF " Height="300" Width="300">
    <DockPanel LastChildFill="True">
        <TextBox DockPanel.Dock="Top" KeyDown="TextBox_KeyEvent" />
        <TextBox Name="txtLog" HorizontalAlignment="Stretch" 
                 IsReadOnly="True" VerticalScrollBarVisibility="Visible"/>
    </DockPanel>
</Window>

//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Input;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void TextBox_KeyEvent(object sender, KeyEventArgs e)
        {
            String msg = String.Format("{0} - {1}
",e.RoutedEvent.Name, e.Key);

            txtLog.Text += msg;
            txtLog.ScrollToEnd();
        }
    }
}

   
    
     

   
  


<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF " Height="300" Width="300">
    <DockPanel LastChildFill="True">
        <TextBox DockPanel.Dock="Top" PreviewKeyUp="TextBox_KeyEvent" />
        <TextBox Name="txtLog" HorizontalAlignment="Stretch" IsReadOnly="True" VerticalScrollBarVisibility="Visible"/>
    </DockPanel>
</Window>

//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Input;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void TextBox_KeyEvent(object sender, KeyEventArgs e)
        {
            String msg = String.Format("{0} - {1}
",e.RoutedEvent.Name, e.Key);

            txtLog.Text += msg;
            txtLog.ScrollToEnd();
        }

    }
}

   
    
     

   
  


<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF " Height="300" Width="300">
    <DockPanel LastChildFill="True">
        <TextBox DockPanel.Dock="Top" KeyUp="TextBox_KeyEvent" />
        <TextBox Name="txtLog" HorizontalAlignment="Stretch" 
                 IsReadOnly="True" VerticalScrollBarVisibility="Visible"/>
    </DockPanel>
</Window>

//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Input;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void TextBox_KeyEvent(object sender, KeyEventArgs e)
        {
            String msg = String.Format("{0} - {1}
",e.RoutedEvent.Name, e.Key);

            txtLog.Text += msg;
            txtLog.ScrollToEnd();
        }
    }
}

   
    
     

   
  

<Window x:Class="WpfApplication1.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="Window1" Height="300" Width="300">
  <Grid>
    <StackPanel>
      <TextBox x:Name="uv" PreviewKeyDown="TextBox_PreviewKeyDown" />

    </StackPanel>
  </Grid>
</Window>


//File:Window1.xaml.cs
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
            DataContext = this;
        }

        //
        private void TextBox_PreviewKeyDown(object sender, RoutedEventArgs e)
        {
            TextBox textBox = sender as TextBox;

            if (textBox != null)
            {
                textBox.Foreground = Brushes.Firebrick;
            }
        }
    }
}

   
    
     

   
  
<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="300" Width="300">
    <StackPanel>
        <TextBox AcceptsReturn="True" Height="100" IsReadOnly="True" 
                 Name="textBox1" TextAlignment="Left" TextWrapping="Wrap" 
                 VerticalScrollBarVisibility="Auto">
            Default starting text.
        </TextBox>
        <WrapPanel Margin="10">
            <Button Margin="5" Name="textButton" Width="75" Click="TextButton_Click">Set Text</Button>
            <Button Margin="5" Name="selectAllButton" Width="75" Click="SelectAllButton_Click">Select All</Button>
            <Button Margin="5" Name="clearButton" Width="75" Click="ClearButton_Click">Clear</Button>
            <Button Margin="5" Name="prependButton" Width="75" Click="PrependButton_Click">Prepend</Button>
            <Button Margin="5" Name="insertButton" Width="75" Click="InsertButton_Click">Insert</Button>
            <Button Margin="5" Name="appendButton" Width="75" Click="AppendButton_Click">Append</Button>
            <Button Margin="5" Name="cutButton" Width="75" Click="CutButton_Click">Cut</Button>
            <Button Margin="5" Name="pasteButton" Width="75" Click="PasteButton_Click">Paste</Button>
            <Button Margin="5" Name="undoButton" Width="75" Click="UndoButton_Click">Undo</Button>
        </WrapPanel>
    </StackPanel>
</Window>
//File:Window.xaml.cs
using System.Windows;
using System.Windows.Controls;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
        private void AppendButton_Click(object sender, RoutedEventArgs e)
        {
            textBox1.AppendText("text");
        }
        private void ClearButton_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Clear();
        }
        private void CutButton_Click(object sender, RoutedEventArgs e)
        {
            if (textBox1.SelectionLength == 0)
            {
                MessageBox.Show("Select text to cut first.", Title);
            }
            else
            {
                MessageBox.Show("Cut: " + textBox1.SelectedText, Title);
                textBox1.Cut();
            }
        }

        private void InsertButton_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text = textBox1.Text.Insert(textBox1.CaretIndex, "text");
        }

        private void PasteButton_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Paste();
        }

        private void PrependButton_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text = textBox1.Text.Insert(0, "Prepend");
        }
        private void SelectAllButton_Click(object sender, RoutedEventArgs e)
        {
            textBox1.SelectAll();
            textBox1.Focus();
        }

        private void TextButton_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Text = "new value";
        }

        private void UndoButton_Click(object sender, RoutedEventArgs e)
        {
            textBox1.Undo();
        }
    }
}

   
    
     

   
  

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="300" Width="300">
    <StackPanel>
        <TextBox AcceptsReturn="True" Height="100" IsReadOnly="True" 
                 Name="textBox1" TextAlignment="Left" TextWrapping="Wrap" 
                 VerticalScrollBarVisibility="Auto">
            Default starting text.
        </TextBox>
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition/>
                <ColumnDefinition/>
            </Grid.ColumnDefinitions>
            <RadioButton Checked="EditableChecked" Grid.Column="0" 
                         HorizontalAlignment="Center" IsChecked="True"
                         Margin="5" Name="editableRadioButton" >
                Editable</RadioButton>
            <RadioButton Checked="EditableChecked" Grid.Column="1" 
                         HorizontalAlignment="Center" Margin="5"
                         Name="readonlyRadioButton">
                Read Only</RadioButton>
        </Grid>
    </StackPanel>
</Window>
//File:Window.xaml.cs
using System.Windows;
using System.Windows.Controls;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
        private void EditableChecked(object sender, RoutedEventArgs e)
        {
            RadioButton button = e.OriginalSource as RadioButton;

            if (e.OriginalSource == editableRadioButton)
            {
                textBox1.IsReadOnly = false;
            }
            else if (e.OriginalSource == readonlyRadioButton)
            {
                textBox1.IsReadOnly = true;
            }

            textBox1.Focus();
        }
    }
}

   
    
     

   
  
<Window x:Class="Commands.TwoDocument"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="TwoDocument" Height="300" Width="300">

  <Window.Resources>
    <CommandBinding x:Key="binding" Command="ApplicationCommands.Save" Executed="SaveCommand" CanExecute="SaveCommand_CanExecute" />
  </Window.Resources>

  <Grid>
    <Grid.RowDefinitions>
      <RowDefinition Height="Auto"></RowDefinition>
      <RowDefinition Height="Auto"></RowDefinition>
      <RowDefinition></RowDefinition>
      <RowDefinition></RowDefinition>
    </Grid.RowDefinitions>
    <Menu Grid.Row="0">
      <MenuItem Header="File">
        <MenuItem Command="New"></MenuItem>
        <MenuItem Command="Open"></MenuItem>
        <MenuItem Command="Save"></MenuItem>
        <MenuItem Command="SaveAs"></MenuItem>
        <Separator></Separator>
        <MenuItem Command="Close"></MenuItem>
      </MenuItem>
    </Menu>

    <TextBox Margin="5" Grid.Row="2" TextWrapping="Wrap" AcceptsReturn="True" TextChanged="txt_TextChanged">
      <TextBox.CommandBindings>
        <StaticResource ResourceKey="binding"></StaticResource>
      </TextBox.CommandBindings>
    </TextBox>

  </Grid>
</Window>
//File:Window.xaml.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

namespace Commands
{
    public partial class TwoDocument : System.Windows.Window
    {
        public TwoDocument()
        {
            InitializeComponent();
        }

        private void SaveCommand(object sender, ExecutedRoutedEventArgs e)
        {            
        }
        private void txt_TextChanged(object sender, RoutedEventArgs e)
        {
        }
        private void SaveCommand_CanExecute(object sender, CanExecuteRoutedEventArgs e)
        {
            e.CanExecute = false;
        }
    }
}